20.11. Pseudostate

A pseudostate encompasses a number of different transient
vertices on a state machine diagram. They are used, typically,
to connect multiple transitions into more complex state
transitions paths. For example, by combining a transition
entering a fork pseudostate with a set of transitions exiting
the fork pseudostate, we get a compound transition that leads
to a set of concurrent target states. Pseudostates do not have
the properties of a full state and serve only as a connection
point for transactions (but with some semantic value). Within
the UML metamodel, Pseudostate is a
sub-class of StateVertex.